Slashes are now valid DOM
Make partials work within templates

So that mustache templates can have partials within them. This will make
it possible to only refresh some of a template rather than the whole
thing.

- Switch to letting the mustache gem load file contents using
  `template_name` and `template_path`
- Override the `partial` method on the view so that it uses the set
  `template_path` otherwise it forgets it.
- Update the JavaScript with a first version that works with partials.
Remove pure mustache part of loader

As hogan is distributed with this gem we don't need to support the
mustache version. Also remove some other methods which don't want
supporting.
Bump version to 0.1.0